Cable Sizing

Transcript

1. Widescreen Test Pattern ( 16:9 ) Aspect Ratio Test (Should appear circular) 16x9 4x3
2. CABLE SIZING SOFTWARE APPLICATION A Presentation By K. Venu Gopal ( 2005U7PS124 )
3. CABLE SIZING
4. Every instrument or device installed in a plant has to be connected to cables for the power supply and the transfer of signals. And each instrument or device has its own specifications for power rating and connections for control cables. Cable Sizing means the proper selection of the cables for the right purpose. For example we have 3 core, 4 core, 5 pair etc. So Choosing the right cable as per the instrument or device’s specifications is cable sizing. WHAT IS CABLE SIZING ?
5. THE REQUIREMENT IS… UNSAFE SAFE
6. Final Conclusion The final conclusion depends on the following three factors.  Comparison of Ampacity  Cable derated current > Full load current  Voltage Drop at Steady State Condition  Allowed voltage drop > calculated voltage drop  Voltage Drop at Starting Condition  Allowed voltage drop > calculated voltage drop
7. Ampacity  Full load current = Full load ampere / root 3  Cable derated current = Ampere rating in single way duct X Overall derated factor X no of runs
8. Voltage drop at steady state This applies only for a 3 phase supply  Voltage drop = [ root (3) X (full load current /2) X cable length X { conductor reistance X pf at rated load + reactance X sin phi } ] / Operating Voltage
9. Voltage drop at starting condition This applies only for a 3 phase supply  Voltage drop = [ root (3) X starting current X cable length X { conductor reistance X pf at rated load + reactance X sin phi } ] / Operating voltage
10.  Full load Ampere = (Motor rating X 1000) / (Power factor at rated load X efficiency at rated load X switchboard voltage)
11.  Active power = Motor rating X (intermittent power / efficiency at rated load )  Reactive power = Active power X tan(cos-1(power factor at load factor ))
12. CABLE DESCRIPTION  Source  Cable Details  Destination
13. CABLE DETAILS  CABLE TYPE  CABLE CODE  VOLTAGE GRADE  CABLE SIZE EARTH  CABLE OUTER SHEATH
14.  CU - Copper  SWA - Steel Wire Armoured  XLPE - Cross Linked Poly Ethylene  PVC - Poly Vinyl Chloride  P - Power Cable  C - Control Cables  G -Grounding Cable
15. Manufacturers Data…  AMPERE RATING IN SINGLE WAY DUCT  CONDUCTOR RESISTANCE  REACTANCE  SHORT CIRCUIT FOR 1 SEC
16. Starting Type  SY = Star delta starter  DOL = Direct on line starting  VSD = Variable speed drive
17. POWER FACTOR & EFFICIENCY  Efficiency at rated load  Power Factor at rated load  Efficiency at Load factor  Power Factor at Load Factor
18. Derating factors are due to…  SOIL THERMAL RESISTIVITY  DEPTH OF LAYING  GROUPING FACTOR  GROUND TEMPERATURE
19. OVERALL DERATING FACTOR  OVERALL DERATING FACTOR = PRODUCT OF  SOIL THERMAL RESISTIVITY  DEPTH OF LAYING  GROUPING FACTOR  GROUND TEMPERATURE
20. THE SOFTWARE APPLICATION
21. MICROSOFT VISUAL BASIC .NET 2005
32. THANK YOU !